Orthogonal long-period fiber grating for directly exciting the orbital angular momentum | Zendy

Zhao Liu | Zendy; Guoxuan Zhu | Zendy; Yali Li | Zendy; Jian Yu | Zendy; Zhiyong Bai | Zendy; Shen Liu | Zendy; Jun He | Zendy; Yiping Wang | Zendy

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Orthogonal long-period fiber grating for directly exciting the orbital angular momentum

Author(s) -

Zhao Liu,

Guoxuan Zhu,

Yali Li,

Jian Yu,

Zhiyong Bai,

Shen Liu,

Jun He,

Yiping Wang

Publication year - 2020

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.399929

Subject(s) - optics , orthogonal polarization spectral imaging , angular momentum , grating , polarization (electrochemistry) , physics , laser , materials science , chemistry , quantum mechanics

An orthogonal long-period fiber grating (OLPFG) is proposed and demonstrated for directly exciting the orbital angular momentum (OAM), without the need for other devices. This grating was produced using CO 2 laser exposure in the orthogonal direction. A helical phase was then optically induced in the OLPFG, with a chirality determined by the structure of the OLPFG. In this study, ±1-order OAM resonances were respectively observed in OLPFGs with a different orthogonal direction. The conversion efficiency of OAM mode in this process was 99%, and the purity was higher than 98%. In addition, incident light in any polarization state was observed to excite OAM with the same polarization.

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